class LikeDate:
    def __eq__(self, other):
         if isinstance(other, LikeDate):
             return True
         else:
              return NotImplemented
    def __ge__(self, other):
         if isinstance(other, LikeDate):
             return True
         else:
              return NotImplemented

class LikeInt:
    def __eq__(self, other):
         if isinstance(other, LikeInt):
             return True
         else:
             return False

    def __ge__(self, other):
         if isinstance(other, LikeInt):
             return True
         else:
              return NotImplemented

a = LikeDate()
b = LikeInt()
print(a == b) # False
print(a == 0) # False, because int provides an __eq__ method that returns False
print(a >= 0) # Error, because nether LikeDate nor int provides a definite comparison for __ge__
print(a >= b) # Error, because neither objects provide a comparable __ge__